Combined door check and spring.



' B. MURPHY.

COMBINED DOOR CHECK AND SPRING. APPLIOATION'PILED FEB.10, 1910.

979, 1 90. Patented Dec. 20, 1910.

THE uonms PETERS co., WASHINGTON, D, z:v

srawnnr orricn.

IBARNEY MURPHY, F MILFORD, CONNECTICUT.

COlViBINED DOOR CHECK AND SPRING.

To all whom it may concern:

Be it known that l. BARNEY MURPHY, a citizen of the United States, residing at Milford, in the county of New Haven and State Connecticut, have invented a new and useful improvement in Combined Door Cheeks 2nd Springs; and I do hereby declare the following, when taken in connection with the accompanying drawings and the letters of reference marked thereon, to he a full. clear, and exact description of the same. and which said drawings constitute part of this specification, and represent. in

Figure l a front view of a door check embodying my invention. Fig. 2 a top or plan view of the same. Fig. a broken plan with the door open. Fig. l a side view of ever and bracket to which it is attached.

T his invention relates to an improvement in combined door spring and check, and. particularly to that class in which provision is made for holding a door in an open position, and while adapted for various purposes, is particularly intended for use in car doors where it is desirable to have the door remain open when pened to a certain degree.

The object of the invention is to provide means for changing the fulcrum of the lever so that when a door is opened to a certain extent, the action of the spring will be reversed and the tendency will be to hold the door open; and the invention consists in the construction hereinafter described and particularly recited in the claims.

In carrying out my invention, I employ a cylinder 2 containing a plunger 3 with its hollow piston rod l like a pneumatic pump with a perforated cap 5 by which the pressure may be regulated. In connection with this cylinder 1 employ a spring chamher 6 through which a spring rod 7 extends, this rod 7 being arranged parallel with and coupled with the piston rod 4 so thatwhen th rod is moved the piston rod will be moved accordingly. On this rod 7 is a spiral spring 8, and a plug or collar 9 is adjustably secured to the rod 7 by a thumb screw 10 so that the pressure of the spring may be adjusted, the spring chamber 6 being slot- Specification of Letters Patent.

Application filed February 10, 1910.

Patented Dec. 20, 191%.

Serial No. 543,019.

l ted for the clearance of the screw. The cylinder and spring chamber are pivotally connected to a bracket attached to the door and the inner end of the rod 7 is pivotally connected to the outer end of a lever 11 which is pivoted to a bracket 12 secured to the door casing, this bracket 12 having a slot 13 by which the bracket may be adjusted as desired. The inner end of the lever is forked to engage with a stop -pin or screw 14, the distance between the ends of the fork being greater than the diameter of the screw so that the lever may be turned.

The tension of the spring and the escapement for the piston will be adjusted according to the uses for which the check is applied. As the door opens the spring 8 will be compressed and the rod 7 draws the piston rod toward the outer end of the cylinder in which direction it moves freely and until the door has passed a predetermined angle. If the door is released the expansion of the spring will tend to close the door, but against the action of the piston in the cylinder. If, however, the door is passed beyond a certain point, the lever 11 will turn on its pivot so as to change the fulcrum of the rod 7, and the tendency then is to open the door as the spring draws at such an angle to the hinges that the draft is the reverse of the first opening movement of the door. The point at which this change of fulcrum will take place is determined by the position of the bracket on the casing, and this may be adjusted at the point at which it is desired to hold the door open.

I claim 1. A combined door check and spring comprising a cylinder, piston and piston rod, and a spring-operated rod arranged parallel with, and connected with said piston rod, a lever pivotally mounted on a bracket and connected at its outer end with said rod whereby the fulcrum of the rod is changed at a predetermined point, and means to limit the movement of said lever.

2. A combined door spring and check comprising a cylinder, a piston and a piston rod, a spring-actuated rod arranged parallel with, and connected with said piston rod, a bracket adapted to be secured to the door In tesiilnolw whereof, I have signed this SPQGlfiCfiUOl) 1n the presence 01 two subscrlb- 111g WHIIQSSQS.

casing, :1 lever pivoted to the outer end 01. I

said bracket and pivotally connected with i said rod, said lever adapted, to turn on its pivut whereby the fulcrum 0f the and. is BARNEY IMI URPHY. changed after the door is opaned to a pre Wih'msses:

defei'nqined extent, and means to limit the l Fnmmzmo C. .iAnLls,

movement of said lever. CLARA L. \VEED. 

